Can I deleting system update files without removing updates?Support

I have an unrooted Evo and I'm really low on internal space and don't want to root...if I could delete the system update files like "com.htc 2.1-update 1" and "Android System 2.1-update1", that would help to free up about 23mb of space...can I uninstall them or would that revert the system to the pre-updated state?

I have an unrooted Evo and I'm really low on internal space and don't want to root...if I could delete the system update files like "com.htc 2.1-update 1" and "Android System 2.1-update1", that would help to free up about 23mb of space...can I uninstall them or would that revert the system to the pre-updated state?